[LifetimeSafety] Add support for GSL Pointer types (#154009) This extends the lifetime safety analysis to support C++ types annotated with `gsl::Pointer`, which represent non-owning "view" types like `std::string_view`. These types have the same lifetime safety concerns as raw pointers and references. - Added support for detecting and analyzing `gsl::Pointer` annotated types in lifetime safety analysis - Implemented handling for various expressions involving `gsl::Pointer` types: - Constructor expressions - Member call expressions (especially conversion operators) - Functional cast expressions - Initialization list expressions - Materialized temporary expressions - Updated the pointer type detection to recognize `gsl::Pointer` types - Added handling for function calls that create borrows through reference parameters Fixes: https://github.com/llvm/llvm-project/issues/152513
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